47575M is a methuselah with a lifespan of 47575 generations, discovered by Adam P. Goucher on February 10, 2019, using apgsearch.[1] It is currently the longest-lasting known methuselah to fit within a 16×16 bounding box, surpassing Homer which was discovered in November of the previous year.

Smaller forms

On the following day, Goucher found an 18-cell form lasting 47484 generations. A few minutes later, Tanner Jacobi and Aidan F. Pierce responded with 16-cell forms each lasting three more generations.[2] Jacobi's variant, shown below, has a lifespan of 47487 generations, a bounding box of 22×17, and an MCPS of 37.